diff --git a/pkg/mining/repository.go b/pkg/mining/repository.go
index bb8bbd2..23abcdb 100644
--- a/pkg/mining/repository.go
+++ b/pkg/mining/repository.go
@@ -83,7 +83,7 @@ func (r *FileRepository[T]) Save(data T) error {
 	return r.saveUnlocked(data)
 }
 
-// r.mutex.Lock(); defer r.mutex.Unlock(); return r.saveUnlocked(data)
+// return r.saveUnlocked(data)  // called by Save and Update while mutex is held
 func (r *FileRepository[T]) saveUnlocked(data T) error {
 	dir := filepath.Dir(r.path)
 	if err := os.MkdirAll(dir, 0755); err != nil {